Seeing everyone's reaction, Sophia pursed her lips and shook her head and said, "I don't know what my mother told me about the reason!"

Martin frowned, not because Sophia even posed like a little girl, but because she thought of a possibility.

"Will they do not exist in themselves? Or are stars mistaken for planets."

In contrast, this explanation is obviously more reasonable.

Otherwise, Martin would really not imagine why the stars in the sky suddenly disappeared.

Although it looks just a tiny star.

But only those who understand astronomy know the meaning of it.

Because there is actually a star under their feet.

Gries was relieved to hear Martin's explanation.

"No! They also have cycles. The planet of Confusing is 125 years, the planet of Fantasy is forty years, and the planet of Death is forthcoming, and the planet of Death is forthcoming." Sophia said with a striking remark.

Martin was a little confused now.

It should not be a matter of overnight for the ancients to be able to observe accurate cycles.

Could it be...there were these three stars that really existed?

And, about a thousand years ago, it was destroyed for some reason?!

Martin still had some difficulty in unimagining how this happened.

"All these are what your mother told you? Has she ever observed these three stars?" he asked.

Sofia nodded, then shook her head sadly again.

Martin did not express his opinion, but said to Sophia:

"Please sit down, Your Highness Sophia, thank you for your knowledge. At least we know what these stars should be called now. There may be some questions to be given to you next."

Gries made two very simple stools with iron blocks and wooden boards on site.

However, everyone was sitting on the stool, so Sofia didn't show any disgust and sat down peacefully.

Mr. Karan sat next to him very naturally, too.

Martin puts the round model on the table.

"Now we know that the planet at our feet is a spherical shape, and there are three planets similar to it inside that are all revolving around the same sun. So what is the problem that comes to your mind first?"

Clin immediately said first: "Is there anyone living on these stars?"

Rocky asked curiously: "What do these stars look like?"

Gress knew Martin’s ideas more clearly and expressed his thoughts: “They are sizes and the distance between them.”

Martin nodded, his eyes continued to move right, and looked at Tia beside Gress.

Tiya said calmly: "Does their time be the same as ours?"

Martin was stunned.

The time in Tiya's mouth refers not only to the orbital period, but may mean curvature.

This has something to do with the mass and speed of the star body.

Continuing to the right, Mr. Karan shook his head without asking a question.

Finally it was Sofia's turn.

She shook her head awkwardly: "When my mother said this to me when she was a child, my first question was: Can we fly to the stars? Now I think about it, it's a bit too naive."

Every time she mentioned her mother, she seemed to feel a little heavy.

Martin couldn't ask about his sad things repeatedly.

In fact, it is not impossible to go to heaven, Martin thought in his heart.

It’s just that you need to point out some pre-tech trees.

"These questions can all be summarized as explorations of other planets, first confirming their periods and orbits, then their size, and the distance between us."

"Now the question is, how do you think we should calculate the distance between us? Not to mention the planets, just take the distance of the sun as an example. Do you have any ideas?"

The few people here immediately became interested when they heard Martin say this.

How to calculate the distance between the planet and the sun without any other information.

Since Martin said that, there must be a way.

Sofia didn't know Martin's teaching method yet, so she asked in confusion: "How should this be calculated? Do you really want to find someone to fly into the sky?"

She hadn't learned trigonometric functions, and Martin didn't blame her. This question was asked by several of her students.

Gries seemed to have thought of something, took out a piece of paper, and began to draw pictures quickly on it.

Martin looked at Mr. Karan.

Judging from the expression on the old man's face, he seemed to have some ideas.

After all, the old man in front of him had already stepped into the advanced sequence of light with half his foot.

Moreover, in the textbooks that Martin gave him, there was also some basic mathematical knowledge, and trigonometric functions were also included.

After a while, Gress raised her head and said almost at the same time with Karan: "As long as we can measure the diameter of the earth, we can calculate the distance between us and these planets!"

Martin nodded with satisfaction, then looked down at Clin, who was still drawing a planetary map and couldn't help but knock on her head.

But at this moment, Tiya, who was beside her, suddenly spoke.

"There is no need to know the diameter of the earth. Just as the distance between the two points measured reaches a certain requirement."

Rocky nodded and said, "Sister Tiya is right. If it is too close, the angle is difficult to measure, and it may cause a large error."

Hearing this, Karan and Gress suddenly realized.

"If the error is the case, I can solve it. I can accurately measure the angle of light."

Clin also thought of a method from the conversation between several people and verified it on paper.

Sophia stared blankly at the people around her.

What are they talking about?

Why do everyone speaks common words but they don’t understand at all?

Sophia felt like a fool.

"This requires the knowledge of trigonometric functions. It is normal that you don't know if you haven't learned it." Martin looked at the confused Sophia and explained with a smile.

"So it's that simple!" Clin said with a smile.

Tiya next to her looked calm, as if it was just a trivial matter.

But the slight smile on the corner of her mouth still betrayed her inner complacent.

Sophia felt even more uncomfortable when she looked at their expressions!

"Let's first discuss the feasibility of this experiment and the specific issues in operation. Let's explain the principle to His Royal Highness the Princess..."

Listening to Martin's slow words, Sophia gradually immersed in this unprecedented class.

The measurement method is very simple, and middle school students understand the principle.

Find two relatively far-distance locations on the earth, measure the distance between the two locations, and then observe the planets in the sky at the same time, the planets and the two observation points form a triangle.

The next thing is very simple. The triangle has a bottom edge and two angles, so just calculate the length of the side edge.

However, this experiment still has to face many problems in actual operation.

Mainly in terms of accuracy.

There will be certain errors when measuring the angle of light.

However, with the help of Mr. Karan, these errors can also be avoided as much as possible and narrowed to a completely acceptable range.

"And, we can also use such measurements to inversely eject the diameter of the earth."

After his thoughts spread, Gress also thought of this.

Martin smiled and nodded, looking very satisfied.

Don't think that these data don't seem to make much sense, at least the diameter of the earth can actually affect them.

For example, the proportion of the continent on the earth, the planning of the route, etc.

On the spiritual world, on the island, a crown suddenly emerged.

A certain gem above emits a golden light, and the light is extremely dazzling and is almost condensed into substance.

Not long after, a ray of light shot out from the crown, turning into a golden belt of light, quickly passing through the spiritual world.

Deep in the spiritual world, in some illusory space.

Things here have no fixed shape or stable appearance.

Like the foam in the water, stretching and shrinking, they are all bubbles.
To be continued...